C# Exception on creating a instance of a object of a Erwind DLL

Question

// I must to create a program that run by a DLL library of the //Software Erwin. // I imported the DLL the project and this is the code :

// The exception is : Error 80040154 unregistered interface

// What' s wrong ? How I can do that ?

// This is the full code :

 using System;
using System.Collections.Generic;
using System.Text;
using System.IO;


namespace Prova1
{

    class MainClass
    {


        public static void Main(string[] args)
        {
            try
            {
                SCAPI.Application scApp = new SCAPI.Application();//Exception

                if (scApp == null)
                {
                    Console.WriteLine("Erwin API could not be started.");
                    return;
                }

                Console.WriteLine(" Hello World!" + scApp.ApiVersion);
            }
            catch (Exception e){

                Console.WriteLine(e.Message);
            }
        }
    }
}